How long it takes to get tested for HIV after having sex depends on the testing methods of the hospital you go to. The window period refers to the period of time after HIV infection when current testing methods cannot detect antibodies. If the hospital you go to uses nucleic acid testing, you can test for HIV infection 2 weeks after having a high-risk life. In general, the fourth generation reagents can be detected after 4 weeks, and most hospitals usually need 12 weeks to detect. But no matter how many weeks to test for HIV, it is usually 6 months after the high-risk life to confirm the diagnosis. If HIV has not been detected at the time of the 6-month test, the patient is basically not infected with HIV. If the HIV infection is detected after 6 months, it needs to be treated promptly.